If you don’t get prompted to perform an automatic update, in Lightroom and in Bridge, go to Help>Check for Updates to update to the new releases.   Lightroom uses Camera Raw when you use the  Edit in Photoshop command on a raw image, so be sure to update both.    Adobe only provides these updates to Lightroom 2 and Photoshop CS4, so if you have an earlier version, you are out of luck until you purchase an upgrade.

Information from Adobe:

Lightroom 2 Bugs – Fixed

  • Web galleries with a Collection Title of six characters would not export or upload
  • The crop aspect ratio could revert to the last selected ratio even when reset to original
  • The crop aspect ratio in Quick Develop could be lost after a crop adjustment The crop aspect ratio lock could be lost after an orientation switch
  • Images could preview incorrectly when imported using the MTP/PTP USB protocol
  • Sony .ARW files may not have been recognized by Lightroom’s import dialog
  • The Japanese language configuration of Lightroom on Mac OS X 10.5 could fail to switch to the print module if the HP B9180 was set as the default printer
  • Metadata options that are intended for use were dimmed incorrectly when exporting DNG files
  • The Japanese language configuration of Lightroom on Mac OS X was missing a shortcut for “Zoom Out”
    Several translation and shortcut corrections were made for the eight additional languages introduced with Lightroom 2.3

New Supported Cameras:
Support for the following cameras has been added in this update.
Canon EOS 500D (Digital Rebel T1i/EOS Kiss X3 Digital)
Canon PowerShot SX1 IS
Epson R-D1x
Hasselblad CF-22
Hasselblad CF-22MS
Hasselblad CF-39
Hasselblad CF-39MS
Hasselblad CFH-22
Hasselblad CFH-39
Hasselblad CFV
Hasselblad 503CWD
Hasselblad H2D-22
Hasselblad H2D-39
Hasselblad H3D-22
Hasselblad H3D-31
Hasselblad H3D-39
Hasselblad H3DII-22
Hasselblad H3DII-31
Hasselblad H3DII-39
Hasselblad H3DII-39MS
Hasselblad H3DII-50
Kodak EasyShare Z980
Nikon D5000
Olympus E-450
Olympus E-620
Panasonic Lumix DMC-GH1
Pentax K-7
Sigma DP2
Sony A230
Sony A330
Sony A380